THIS SATURDAY, MARCH 3 IS SHAPING UP to be full of opportunity—to burn calories, raise money for children’s charity, and pretend you’re an extra in Ariana Grande’s “Side to Side” music video.

Starting at 8 a.m., fitness centers around the city are hosting indoor cycling relays for two benevolent causes: The 23rd Annual Periwinkle Cycle benefits The Periwinkle Foundation, which develops pediatric cancer programs, and the 3rd Annual Ride for a Reason fundraises for St. Jude and the Life Time Foundation, the latter which aims to boost nutrition in schools.

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